Display panel with a graphical user interface



The sole FIGURE is a front view of a display panel with a graphical user interface showing the new design.

The broken lines shown in the FIGURE including portions of the display panel and portions of graphical user interface are for the purpose of illustrating portions of the article and form no part of the claimed design. 

CLAIM The ornamental design for a display panel with a graphical user interface, as shown and described. 